the kind of thing you can have happen when you never had learned how to win, had a great round and lost focus. She signed her scorecard but it was AFTER she left the scoring area ... leaving the scoring area without signing is an automatic DQ. The fact she signed it after someone brought it to her after she left the area just shows how confused(and likely immature) she is. She had to know she was done.
Would she have admitted the error if someone hadn't informed the LPGA?
It is troubling that she did not immediately turn herself in at the time of the incident.